Gary C. Steven, M.D.
NPI 1972530699ActiveIndividual· Allergy & Immunology, Allergy· Greenfield, WI
Allergy & Immunology, Allergy (M.D.) in Greenfield, Wisconsin, trained at Medical College of Wisconsin (class of 1991). Their prescriptions cost Medicare Part D more than their services did: $919,440 for 1,711 claims, against $115,639 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 16 companies reporting payments in 2025, $14,396 in all, mostly speaking and faculty fees.
Overview
| NPI | 1972530699 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 27, 2006 |
| Last updated in NPPES | Jul 9, 2020 |
| Certified by provider | Jul 9, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Allergy & Immunology, Allergy Primary | 207KA0200X | 33574020 | WI |
| Specialist | 174400000X | 33574020 | WI |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Allergy/Immunology (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 189 |
|---|---|
| Services billed | 5,830 across 32 procedure codes |
| Paid by Medicare | $115,639 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,711 · 2,885 30-day fills |
|---|---|
| Patients | 317 |
| Total drug cost | $919,440 |
| Generic share | 51% of claims |
Education and affiliations
| Medical school | Medical College of Wisconsin |
|---|---|
| Graduation year | 1991 |
| Medicare specialty | Allergy/Immunology |
| Telehealth | Offers telehealth |
Medical group
- Allergy Asthma and Sinus Center SCGreenfield, WI · 3 clinicians
Industry payments (Open Payments)
- 2025$14,396 · 115 payments from 16 companies
- 2024$22,255 · 102 payments from 19 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $11,386 | 35 |
| Glaxosmithkline, LLC. | $1,157 | 28 |
| Genzyme Corporation | $462.29 | 13 |
| Novartis Pharmaceuticals Corporation | $279.90 | 5 |
| Optinose US, Inc. | $185.56 | 7 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$9,300 · 5 payments
- Food and Beverage$4,016 · 102 payments
- Travel and Lodging$946.18 · 6 payments
- Education$133.26 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records